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authorFelix Fietkau <nbd@nbd.name>2019-08-12 12:24:06 +0200
committerFelix Fietkau <nbd@nbd.name>2019-08-12 12:27:06 +0200
commit7ec092e64125b920aee6d1767dacea3f61b2fa6f (patch)
tree8344335456c0a79dfea092be51ed23233f709538 /package/kernel/mac80211
parent9861050b85e5381c93d73ffdbc24c130400e0fb8 (diff)
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Revert faulty tree push
Revert "mac80211: add new minstrel_ht patches to improve probing on mt76x2" (9861050b85e5381c93d73ffdbc24c130400e0fb8) Revert "kernel: use bulk free in kfree_skb_list to improve performance" (98b654de2e7502507b31f0fb82befbb48f9c8542) Revert "ramips: add preliminary support for WIO ONE" (085141dc5ba5e763e1bf4c1a2fd6957160810ccc) Revert "ramips: add preliminary support for SGE AP-MTKH7-0006 developer board" (b1db6d0539511f60bf65fbde28b16afa31180e34) Revert "build: use config.site generated by autoconf-lean, drop hardcoded sitefiles" (363ce4329d4f6c00b4a7cb83dd1821fafc0d40ad) Revert "toolchain: add autoconf-lean" (fdb30eed03ae56cd87078b64d9b2fac00799e783) Revert "build: allow overriding the filename on the remote server when downloading" (6fa0e07758524eddf20c9b66dfcb55c490e1961e) Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'package/kernel/mac80211')
-rw-r--r--package/kernel/mac80211/patches/subsys/363-mac80211-minstrel_ht-fix-per-group-max-throughput-ra.patch22
-rw-r--r--package/kernel/mac80211/patches/subsys/364-mac80211-minstrel_ht-reduce-unnecessary-rate-probing.patch42
-rw-r--r--package/kernel/mac80211/patches/subsys/365-mac80211-minstrel_ht-fix-default-max-throughput-rate.patch46
-rw-r--r--package/kernel/mac80211/patches/subsys/366-mac80211-minstrel_ht-improve-rate-probing-for-device.patch481
4 files changed, 0 insertions, 591 deletions
diff --git a/package/kernel/mac80211/patches/subsys/363-mac80211-minstrel_ht-fix-per-group-max-throughput-ra.patch b/package/kernel/mac80211/patches/subsys/363-mac80211-minstrel_ht-fix-per-group-max-throughput-ra.patch
deleted file mode 100644
index 87a987dcf9..0000000000
--- a/package/kernel/mac80211/patches/subsys/363-mac80211-minstrel_ht-fix-per-group-max-throughput-ra.patch
+++ /dev/null
@@ -1,22 +0,0 @@
-From: Felix Fietkau <nbd@nbd.name>
-Date: Fri, 14 Jun 2019 21:12:04 +0200
-Subject: [PATCH] mac80211: minstrel_ht: fix per-group max throughput rate
- initialization
-
-The group number needs to be multiplied by the number of rates per group
-to get the full rate index
-
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
-
---- a/net/mac80211/rc80211_minstrel_ht.c
-+++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -576,7 +576,7 @@ minstrel_ht_update_stats(struct minstrel
-
- /* (re)Initialize group rate indexes */
- for(j = 0; j < MAX_THR_RATES; j++)
-- tmp_group_tp_rate[j] = group;
-+ tmp_group_tp_rate[j] = MCS_GROUP_RATES * group;
-
- for (i = 0; i < MCS_GROUP_RATES; i++) {
- if (!(mi->supported[group] & BIT(i)))
diff --git a/package/kernel/mac80211/patches/subsys/364-mac80211-minstrel_ht-reduce-unnecessary-rate-probing.patch b/package/kernel/mac80211/patches/subsys/364-mac80211-minstrel_ht-reduce-unnecessary-rate-probing.patch
deleted file mode 100644
index 96dcdf6e02..0000000000
--- a/package/kernel/mac80211/patches/subsys/364-mac80211-minstrel_ht-reduce-unnecessary-rate-probing.patch
+++ /dev/null
@@ -1,42 +0,0 @@
-From: Felix Fietkau <nbd@nbd.name>
-Date: Wed, 5 Jun 2019 20:42:49 +0200
-Subject: [PATCH] mac80211: minstrel_ht: reduce unnecessary rate probing
- attempts
-
-On hardware with static fallback tables (e.g. mt76x2), rate probing attempts
-can be very expensive.
-On such devices, avoid sampling rates slower than the per-group max throughput
-rate, based on the assumption that the fallback table will take care of probing
-lower rates within that group if the higher rates fail.
-To make this work, this also fixes a wrong initialization in the previously
-unused per-group sorted rate array.
-To further reduce unnecessary probing attempts, skip duplicate attempts on
-rates slower than the max throughput rate.
-
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
-
---- a/net/mac80211/rc80211_minstrel_ht.c
-+++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -1062,6 +1062,21 @@ minstrel_get_sample_rate(struct minstrel
- minstrel_get_duration(mi->max_prob_rate) * 3 < sample_dur)
- return -1;
-
-+
-+ /*
-+ * For devices with no configurable multi-rate retry, skip sampling
-+ * below the per-group max throughput rate, and only use one sampling
-+ * attempt per rate
-+ */
-+ if (mp->hw->max_rates == 1 &&
-+ (minstrel_get_duration(mg->max_group_tp_rate[0]) < sample_dur ||
-+ mrs->attempts))
-+ return -1;
-+
-+ /* Skip already sampled slow rates */
-+ if (sample_dur >= minstrel_get_duration(tp_rate1) && mrs->attempts)
-+ return -1;
-+
- /*
- * Make sure that lower rates get sampled only occasionally,
- * if the link is working perfectly.
diff --git a/package/kernel/mac80211/patches/subsys/365-mac80211-minstrel_ht-fix-default-max-throughput-rate.patch b/package/kernel/mac80211/patches/subsys/365-mac80211-minstrel_ht-fix-default-max-throughput-rate.patch
deleted file mode 100644
index f1e684cad8..0000000000
--- a/package/kernel/mac80211/patches/subsys/365-mac80211-minstrel_ht-fix-default-max-throughput-rate.patch
+++ /dev/null
@@ -1,46 +0,0 @@
-From: Felix Fietkau <nbd@nbd.name>
-Date: Fri, 14 Jun 2019 21:14:22 +0200
-Subject: [PATCH] mac80211: minstrel_ht: fix default max throughput rate
- indexes
-
-Use the first supported rate instead of 0 (which can be invalid)
-
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
-
---- a/net/mac80211/rc80211_minstrel_ht.c
-+++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -487,7 +487,7 @@ minstrel_ht_assign_best_tp_rates(struct
- tmp_prob = mi->groups[tmp_group].rates[tmp_idx].prob_ewma;
- tmp_mcs_tp = minstrel_ht_get_tp_avg(mi, tmp_group, tmp_idx, tmp_prob);
-
-- if (tmp_cck_tp > tmp_mcs_tp) {
-+ if (tmp_cck_tp_rate && tmp_cck_tp > tmp_mcs_tp) {
- for(i = 0; i < MAX_THR_RATES; i++) {
- minstrel_ht_sort_best_tp_rates(mi, tmp_cck_tp_rate[i],
- tmp_mcs_tp_rate);
-@@ -559,11 +559,19 @@ minstrel_ht_update_stats(struct minstrel
- mi->sample_slow = 0;
- mi->sample_count = 0;
-
-- /* Initialize global rate indexes */
-- for(j = 0; j < MAX_THR_RATES; j++){
-- tmp_mcs_tp_rate[j] = 0;
-- tmp_cck_tp_rate[j] = 0;
-- }
-+ memset(tmp_mcs_tp_rate, 0, sizeof(tmp_mcs_tp_rate));
-+ memset(tmp_cck_tp_rate, 0, sizeof(tmp_cck_tp_rate));
-+ if (mi->supported[MINSTREL_CCK_GROUP])
-+ for (j = 0; j < ARRAY_SIZE(tmp_cck_tp_rate); j++)
-+ tmp_cck_tp_rate[j] = MINSTREL_CCK_GROUP * MCS_GROUP_RATES;
-+
-+ if (mi->supported[MINSTREL_VHT_GROUP_0])
-+ index = MINSTREL_VHT_GROUP_0 * MCS_GROUP_RATES;
-+ else
-+ index = MINSTREL_HT_GROUP_0 * MCS_GROUP_RATES;
-+
-+ for (j = 0; j < ARRAY_SIZE(tmp_mcs_tp_rate); j++)
-+ tmp_mcs_tp_rate[j] = index;
-
- /* Find best rate sets within all MCS groups*/
- for (group = 0; group < ARRAY_SIZE(minstrel_mcs_groups); group++) {
diff --git a/package/kernel/mac80211/patches/subsys/366-mac80211-minstrel_ht-improve-rate-probing-for-device.patch b/package/kernel/mac80211/patches/subsys/366-mac80211-minstrel_ht-improve-rate-probing-for-device.patch
deleted file mode 100644
index 2dd57e0f22..0000000000
--- a/package/kernel/mac80211/patches/subsys/366-mac80211-minstrel_ht-improve-rate-probing-for-device.patch
+++ /dev/null
@@ -1,481 +0,0 @@
-From: Felix Fietkau <nbd@nbd.name>
-Date: Fri, 14 Jun 2019 21:15:47 +0200
-Subject: [PATCH] mac80211: minstrel_ht: improve rate probing for devices
- with static fallback
-
-On some devices that only support static rate fallback tables sending rate
-control probing packets can be really expensive.
-Probing lower rates can already hurt throughput quite a bit. What hurts even
-more is the fact that on mt76x0/mt76x2, single probing packets can only be
-forced by directing packets at a different internal hardware queue, which
-causes some heavy reordering and extra latency.
-The reordering issue is mainly problematic while pushing lots of packets to
-a particular station. If there is little activity, the overhead of probing is
-neglegible.
-
-The static fallback behavior is designed to pretty much only handle rate
-control algorithms that use only a very limited set of rates on which the
-algorithm switches up/down based on packet error rate.
-
-In order to better support that kind of hardware, this patch implements a
-different approach to rate probing where it switches to a slightly higher rate,
-waits for tx status feedback, then updates the stats and switches back to
-the new max throughput rate. This only triggers above a packet rate of 100
-per stats interval (~50ms).
-For that kind of probing, the code has to reduce the set of probing rates
-a lot more compared to single packet probing, so it uses only one packet
-per MCS group which is either slightly faster, or as close as possible to
-the max throughput rate.
-This allows switching between similar rates with different numbers of
-streams. The algorithm assumes that the hardware will work its way lower
-within an MCS group in case of retransmissions, so that lower rates don't
-have to be probed by the high packets per second rate probing code.
-
-To further reduce the search space, it also does not probe rates with lower
-channel bandwidth than the max throughput rate.
-
-At the moment, these changes will only affect mt76x0/mt76x2.
-
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
-
---- a/net/mac80211/rc80211_minstrel.h
-+++ b/net/mac80211/rc80211_minstrel.h
-@@ -114,6 +114,7 @@ struct minstrel_sta_info {
- struct minstrel_priv {
- struct ieee80211_hw *hw;
- bool has_mrr;
-+ u32 sample_switch;
- unsigned int cw_min;
- unsigned int cw_max;
- unsigned int max_retry;
---- a/net/mac80211/rc80211_minstrel_ht.c
-+++ b/net/mac80211/rc80211_minstrel_ht.c
-@@ -21,6 +21,8 @@
- #define AVG_AMPDU_SIZE 16
- #define AVG_PKT_SIZE 1200
-
-+#define SAMPLE_SWITCH_THR 100
-+
- /* Number of bits for an average sized packet */
- #define MCS_NBITS ((AVG_PKT_SIZE * AVG_AMPDU_SIZE) << 3)
-
-@@ -59,6 +61,7 @@
- [GROUP_IDX(_streams, _sgi, _ht40)] = { \
- .streams = _streams, \
- .shift = _s, \
-+ .bw = _ht40, \
- .flags = \
- IEEE80211_TX_RC_MCS | \
- (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
-@@ -95,6 +98,7 @@
- [VHT_GROUP_IDX(_streams, _sgi, _bw)] = { \
- .streams = _streams, \
- .shift = _s, \
-+ .bw = _bw, \
- .flags = \
- IEEE80211_TX_RC_VHT_MCS | \
- (_sgi ? IEEE80211_TX_RC_SHORT_GI : 0) | \
-@@ -527,6 +531,133 @@ minstrel_ht_prob_rate_reduce_streams(str
- }
- }
-
-+static inline int
-+minstrel_get_duration(int index)
-+{
-+ const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
-+ unsigned int duration = group->duration[index % MCS_GROUP_RATES];
-+ return duration << group->shift;
-+}
-+
-+static bool
-+minstrel_ht_probe_group(struct minstrel_ht_sta *mi, const struct mcs_group *tp_group,
-+ int tp_idx, const struct mcs_group *group)
-+{
-+ if (group->bw < tp_group->bw)
-+ return false;
-+
-+ if (group->streams == tp_group->streams)
-+ return true;
-+
-+ if (tp_idx < 4 && group->streams == tp_group->streams - 1)
-+ return true;
-+
-+ return group->streams == tp_group->streams + 1;
-+}
-+
-+static void
-+minstrel_ht_find_probe_rates(struct minstrel_ht_sta *mi, u16 *rates, int *n_rates,
-+ bool faster_rate)
-+{
-+ const struct mcs_group *group, *tp_group;
-+ int i, g, max_dur;
-+ int tp_idx;
-+
-+ tp_group = &minstrel_mcs_groups[mi->max_tp_rate[0] / MCS_GROUP_RATES];
-+ tp_idx = mi->max_tp_rate[0] % MCS_GROUP_RATES;
-+
-+ max_dur = minstrel_get_duration(mi->max_tp_rate[0]);
-+ if (faster_rate)
-+ max_dur -= max_dur / 16;
-+
-+ for (g = 0; g < MINSTREL_GROUPS_NB; g++) {
-+ u16 supported = mi->supported[g];
-+
-+ if (!supported)
-+ continue;
-+
-+ group = &minstrel_mcs_groups[g];
-+ if (!minstrel_ht_probe_group(mi, tp_group, tp_idx, group))
-+ continue;
-+
-+ for (i = 0; supported; supported >>= 1, i++) {
-+ int idx;
-+
-+ if (!(supported & 1))
-+ continue;
-+
-+ if ((group->duration[i] << group->shift) > max_dur)
-+ continue;
-+
-+ idx = g * MCS_GROUP_RATES + i;
-+ if (idx == mi->max_tp_rate[0])
-+ continue;
-+
-+ rates[(*n_rates)++] = idx;
-+ break;
-+ }
-+ }
-+}
-+
-+static void
-+minstrel_ht_rate_sample_switch(struct minstrel_priv *mp,
-+ struct minstrel_ht_sta *mi)
-+{
-+ struct minstrel_rate_stats *mrs;
-+ u16 rates[MINSTREL_GROUPS_NB];
-+ int n_rates = 0;
-+ int probe_rate = 0;
-+ bool faster_rate;
-+ int i;
-+ u8 random;
-+
-+ /*
-+ * Use rate switching instead of probing packets for devices with
-+ * little control over retry fallback behavior
-+ */
-+ if (mp->hw->max_rates > 1)
-+ return;
-+
-+ /*
-+ * If the current EWMA prob is >75%, look for a rate that's 6.25%
-+ * faster than the max tp rate.
-+ * If that fails, look again for a rate that is at least as fast
-+ */
-+ mrs = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
-+ faster_rate = mrs->prob_ewma > MINSTREL_FRAC(75, 100);
-+ minstrel_ht_find_probe_rates(mi, rates, &n_rates, faster_rate);
-+ if (!n_rates && faster_rate)
-+ minstrel_ht_find_probe_rates(mi, rates, &n_rates, false);
-+
-+ /* If no suitable rate was found, try to pick the next one in the group */
-+ if (!n_rates) {
-+ int g_idx = mi->max_tp_rate[0] / MCS_GROUP_RATES;
-+ u16 supported = mi->supported[g_idx];
-+
-+ supported >>= mi->max_tp_rate[0] % MCS_GROUP_RATES;
-+ for (i = 0; supported; i++) {
-+ if (!(supported & 1))
-+ continue;
-+
-+ probe_rate = mi->max_tp_rate[0] + i;
-+ goto out;
-+ }
-+
-+ return;
-+ }
-+
-+ i = 0;
-+ if (n_rates > 1) {
-+ random = prandom_u32();
-+ i = random % n_rates;
-+ }
-+ probe_rate = rates[i];
-+
-+out:
-+ mi->sample_rate = probe_rate;
-+ mi->sample_mode = MINSTREL_SAMPLE_ACTIVE;
-+}
-+
- /*
- * Update rate statistics and select new primary rates
- *
-@@ -537,7 +668,8 @@ minstrel_ht_prob_rate_reduce_streams(str
- * higher throughput rates, even if the probablity is a bit lower
- */
- static void
--minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
-+minstrel_ht_update_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
-+ bool sample)
- {
- struct minstrel_mcs_group_data *mg;
- struct minstrel_rate_stats *mrs;
-@@ -545,6 +677,18 @@ minstrel_ht_update_stats(struct minstrel
- u16 tmp_mcs_tp_rate[MAX_THR_RATES], tmp_group_tp_rate[MAX_THR_RATES];
- u16 tmp_cck_tp_rate[MAX_THR_RATES], index;
-
-+ mi->sample_mode = MINSTREL_SAMPLE_IDLE;
-+
-+ if (sample) {
-+ mi->total_packets_cur = mi->total_packets -
-+ mi->total_packets_last;
-+ mi->total_packets_last = mi->total_packets;
-+ }
-+ if (!mp->sample_switch)
-+ sample = false;
-+ if (mi->total_packets_cur < SAMPLE_SWITCH_THR && mp->sample_switch != 1)
-+ sample = false;
-+
- if (mi->ampdu_packets > 0) {
- if (!ieee80211_hw_check(mp->hw, TX_STATUS_NO_AMPDU_LEN))
- mi->avg_ampdu_len = minstrel_ewma(mi->avg_ampdu_len,
-@@ -631,12 +775,16 @@ minstrel_ht_update_stats(struct minstrel
- /* try to sample all available rates during each interval */
- mi->sample_count *= 8;
-
-+ if (sample)
-+ minstrel_ht_rate_sample_switch(mp, mi);
-+
- #ifdef CPTCFG_MAC80211_DEBUGFS
- /* use fixed index if set */
- if (mp->fixed_rate_idx != -1) {
- for (i = 0; i < 4; i++)
- mi->max_tp_rate[i] = mp->fixed_rate_idx;
- mi->max_prob_rate = mp->fixed_rate_idx;
-+ mi->sample_mode = MINSTREL_SAMPLE_IDLE;
- }
- #endif
-
-@@ -740,15 +888,17 @@ minstrel_ht_tx_status(void *priv, struct
- struct minstrel_ht_sta_priv *msp = priv_sta;
- struct minstrel_ht_sta *mi = &msp->ht;
- struct ieee80211_tx_rate *ar = info->status.rates;
-- struct minstrel_rate_stats *rate, *rate2;
-+ struct minstrel_rate_stats *rate, *rate2, *rate_sample = NULL;
- struct minstrel_priv *mp = priv;
- bool last, update = false;
-+ bool sample_status = false;
- int i;
-
- if (!msp->is_ht)
- return mac80211_minstrel.tx_status_ext(priv, sband,
- &msp->legacy, st);
-
-+
- /* This packet was aggregated but doesn't carry status info */
- if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
- !(info->flags & IEEE80211_TX_STAT_AMPDU))
-@@ -774,12 +924,17 @@ minstrel_ht_tx_status(void *priv, struct
- if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
- mi->sample_packets += info->status.ampdu_len;
-
-+ if (mi->sample_mode != MINSTREL_SAMPLE_IDLE)
-+ rate_sample = minstrel_get_ratestats(mi, mi->sample_rate);
-+
- last = !minstrel_ht_txstat_valid(mp, &ar[0]);
- for (i = 0; !last; i++) {
- last = (i == IEEE80211_TX_MAX_RATES - 1) ||
- !minstrel_ht_txstat_valid(mp, &ar[i + 1]);
-
- rate = minstrel_ht_get_stats(mp, mi, &ar[i]);
-+ if (rate == rate_sample)
-+ sample_status = true;
-
- if (last)
- rate->success += info->status.ampdu_ack_len;
-@@ -787,44 +942,60 @@ minstrel_ht_tx_status(void *priv, struct
- rate->attempts += ar[i].count * info->status.ampdu_len;
- }
-
-- /*
-- * check for sudden death of spatial multiplexing,
-- * downgrade to a lower number of streams if necessary.
-- */
-- rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
-- if (rate->attempts > 30 &&
-- MINSTREL_FRAC(rate->success, rate->attempts) <
-- MINSTREL_FRAC(20, 100)) {
-- minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
-+ switch (mi->sample_mode) {
-+ case MINSTREL_SAMPLE_IDLE:
-+ break;
-+
-+ case MINSTREL_SAMPLE_ACTIVE:
-+ if (!sample_status)
-+ break;
-+
-+ mi->sample_mode = MINSTREL_SAMPLE_PENDING;
- update = true;
-- }
-+ break;
-+
-+ case MINSTREL_SAMPLE_PENDING:
-+ if (sample_status)
-+ break;
-
-- rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
-- if (rate2->attempts > 30 &&
-- MINSTREL_FRAC(rate2->success, rate2->attempts) <
-- MINSTREL_FRAC(20, 100)) {
-- minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
- update = true;
-+ minstrel_ht_update_stats(mp, mi, false);
-+ break;
-+ }
-+
-+
-+ if (mp->hw->max_rates > 1) {
-+ /*
-+ * check for sudden death of spatial multiplexing,
-+ * downgrade to a lower number of streams if necessary.
-+ */
-+ rate = minstrel_get_ratestats(mi, mi->max_tp_rate[0]);
-+ if (rate->attempts > 30 &&
-+ MINSTREL_FRAC(rate->success, rate->attempts) <
-+ MINSTREL_FRAC(20, 100)) {
-+ minstrel_downgrade_rate(mi, &mi->max_tp_rate[0], true);
-+ update = true;
-+ }
-+
-+ rate2 = minstrel_get_ratestats(mi, mi->max_tp_rate[1]);
-+ if (rate2->attempts > 30 &&
-+ MINSTREL_FRAC(rate2->success, rate2->attempts) <
-+ MINSTREL_FRAC(20, 100)) {
-+ minstrel_downgrade_rate(mi, &mi->max_tp_rate[1], false);
-+ update = true;
-+ }
- }
-
- if (time_after(jiffies, mi->last_stats_update +
- (mp->update_interval / 2 * HZ) / 1000)) {
- update = true;
-- minstrel_ht_update_stats(mp, mi);
-+ minstrel_ht_update_stats(mp, mi, true);
- }
-
- if (update)
- minstrel_ht_update_rates(mp, mi);
- }
-
--static inline int
--minstrel_get_duration(int index)
--{
-- const struct mcs_group *group = &minstrel_mcs_groups[index / MCS_GROUP_RATES];
-- unsigned int duration = group->duration[index % MCS_GROUP_RATES];
-- return duration << group->shift;
--}
--
- static void
- minstrel_calc_retransmit(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
- int index)
-@@ -989,14 +1160,18 @@ static void
- minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
- {
- struct ieee80211_sta_rates *rates;
-+ u16 first_rate = mi->max_tp_rate[0];
- int i = 0;
-
-+ if (mi->sample_mode == MINSTREL_SAMPLE_ACTIVE)
-+ first_rate = mi->sample_rate;
-+
- rates = kzalloc(sizeof(*rates), GFP_ATOMIC);
- if (!rates)
- return;
-
- /* Start with max_tp_rate[0] */
-- minstrel_ht_set_rate(mp, mi, rates, i++, mi->max_tp_rate[0]);
-+ minstrel_ht_set_rate(mp, mi, rates, i++, first_rate);
-
- if (mp->hw->max_rates >= 3) {
- /* At least 3 tx rates supported, use max_tp_rate[1] next */
-@@ -1023,6 +1198,11 @@ minstrel_get_sample_rate(struct minstrel
- int tp_rate1, tp_rate2;
- int sample_idx = 0;
-
-+ if (mp->hw->max_rates == 1 && mp->sample_switch &&
-+ (mi->total_packets_cur >= SAMPLE_SWITCH_THR ||
-+ mp->sample_switch == 1))
-+ return -1;
-+
- if (mi->sample_wait > 0) {
- mi->sample_wait--;
- return -1;
-@@ -1349,7 +1529,7 @@ minstrel_ht_update_caps(void *priv, stru
- mi->supported[MINSTREL_CCK_GROUP] |= mi->cck_supported_short << 4;
-
- /* create an initial rate table with the lowest supported rates */
-- minstrel_ht_update_stats(mp, mi);
-+ minstrel_ht_update_stats(mp, mi, true);
- minstrel_ht_update_rates(mp, mi);
-
- return;
-@@ -1467,6 +1647,8 @@ minstrel_ht_alloc(struct ieee80211_hw *h
- if (!mp)
- return NULL;
-
-+ mp->sample_switch = -1;
-+
- /* contention window settings
- * Just an approximation. Using the per-queue values would complicate
- * the calculations and is probably unnecessary */
-@@ -1498,6 +1680,8 @@ minstrel_ht_alloc(struct ieee80211_hw *h
- mp->fixed_rate_idx = (u32) -1;
- debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
- &mp->fixed_rate_idx);
-+ debugfs_create_u32("sample_switch", S_IRUGO | S_IWUSR, debugfsdir,
-+ &mp->sample_switch);
- #endif
-
- minstrel_ht_init_cck_rates(mp);
---- a/net/mac80211/rc80211_minstrel_ht.h
-+++ b/net/mac80211/rc80211_minstrel_ht.h
-@@ -36,6 +36,7 @@ struct mcs_group {
- u16 flags;
- u8 streams;
- u8 shift;
-+ u8 bw;
- u16 duration[MCS_GROUP_RATES];
- };
-
-@@ -53,6 +54,12 @@ struct minstrel_mcs_group_data {
- struct minstrel_rate_stats rates[MCS_GROUP_RATES];
- };
-
-+enum minstrel_sample_mode {
-+ MINSTREL_SAMPLE_IDLE,
-+ MINSTREL_SAMPLE_ACTIVE,
-+ MINSTREL_SAMPLE_PENDING,
-+};
-+
- struct minstrel_ht_sta {
- struct ieee80211_sta *sta;
-
-@@ -74,6 +81,8 @@ struct minstrel_ht_sta {
- unsigned int overhead;
- unsigned int overhead_rtscts;
-
-+ unsigned int total_packets_last;
-+ unsigned int total_packets_cur;
- unsigned int total_packets;
- unsigned int sample_packets;
-
-@@ -85,6 +94,9 @@ struct minstrel_ht_sta {
- u8 sample_count;
- u8 sample_slow;
-
-+ enum minstrel_sample_mode sample_mode;
-+ u16 sample_rate;
-+
- /* current MCS group to be sampled */
- u8 sample_group;
-